I agree with John Donne when he says that in a philosophical sense it's perfectly normal to feel sad, to mourn the death of a complete stranger:
any mans death diminishes me,
because I am involved in Mankinde;
And therefore never send to know for whom the bell tolls;
It tolls for thee.
any mans death diminishes me,
because I am involved in Mankinde;
And therefore never send to know for whom the bell tolls;
It tolls for thee.